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    lisguz's Avatar
    lisguz Posts: 1, Reputation: 1
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    #1

    Nov 17, 2008, 12:52 PM
    i need tosolve an equation of completing the square
    I need to find an answer with my pre- calculus homework is really hard because is X2+2x+10=0 and I can't think of an answer. The method I have to use is completing the square
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Nov 18, 2008, 10:24 AM

    To complete the square:

    x^2 + 2x + 10 =0
    x^2 + 2x + 1 - 1 + 10 = 0
    (x+1)^2 = -9
    x+1 = +/- sqrt (-9)
    x = +/- sqrt(-9) -1

    Note that because the answer has a square root of a negative number, there are no real solutions to this. That is, if you make a graph of the function x^2 + 2x + 10 you will see that there is no place where the graph crosses the x axis.
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